High intensity directional electroacoustic sound generating system for communications targeting
First Claim
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1. An electro-acoustic sound generator system for generating a high intensity directional sound column in a far field comprising:
- an acoustic emitter with at least one transducer acoustic emission region;
at least one power amplifier channel adapted to receive at least an audio signal;
at least a length of the emitter being scaled to be at least four times a wavelength of a lowest frequency of at least one maximum acoustic output primary acoustic signal;
at least a depth of the emitter being scaled to be less than one fourth the dimension of the length; and
the emitter being configured and tuned to exhibit high efficiency over at least a narrow bandwidth corresponding to a frequency range of maximum sensitivity of a human auditory system, to generate a directed high intensity sound beam with an axial acoustic output of at least 140 dB at a minimum of 2 meters.
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Abstract
A compact lightweight electro-acoustic transducer system for generating high intensity, highly directional audio output. The transducer system can generate acoustic intensity levels that can drive the transmission medium to non-linearity such that highly directional secondary sound also can appear in the audible range allowing direct and parametric sound generation from a single acoustic emission system. The device can be used for both distant and/or high intensity communications to convey information, provide high intensity acoustical targeting and/or disrupt or mask other communications.
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Citations
60 Claims
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1. An electro-acoustic sound generator system for generating a high intensity directional sound column in a far field comprising:
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an acoustic emitter with at least one transducer acoustic emission region;
at least one power amplifier channel adapted to receive at least an audio signal;
at least a length of the emitter being scaled to be at least four times a wavelength of a lowest frequency of at least one maximum acoustic output primary acoustic signal;
at least a depth of the emitter being scaled to be less than one fourth the dimension of the length; and
the emitter being configured and tuned to exhibit high efficiency over at least a narrow bandwidth corresponding to a frequency range of maximum sensitivity of a human auditory system, to generate a directed high intensity sound beam with an axial acoustic output of at least 140 dB at a minimum of 2 meters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A method for generating highly directional acoustic signals in the audio range of both direct and secondary parametric acoustic generation in a sound-supporting medium with said method including the steps of:
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a) directly generating at least one high intensity audible tone below 20 kHz from an transducer emitter system having at least one dimension that is greater than that of the wavelength of at least one of the high intensity audible tones;
b) operating the transducer emitter system such that it generates the high intensity audible tone at a level greater than a level that creates a significant nonlinear output in the sound supporting medium; and
c) driving the sound-supporting medium into nonlinearity such that at least one audible secondary output is created in the sound supporting medium. - View Dependent Claims (54, 55, 56)
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57. An electro-acoustic sound generator system for generating a high intensity directional sound column in a far field comprising:
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at least one power amplifier channel adapted to receive an audio signal;
an acoustic emitter having a pass-band region tuned to at least a frequency range of maximum sensitivity of a human auditory system, and having a known high-pass cutoff frequency; and
an emission surface having a length of at least four times a wavelength of the high-pass cutoff frequency for enabling high intensity propagation of a directional sound column for frequencies greater than the high-pass cutoff frequency, and having a depth no greater than one-forth of the length of the emission surface wavelength of the high-pass cutoff frequency. - View Dependent Claims (58)
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59. An electro-acoustic sound generator system to be used as a non-lethal weapon, comprising:
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at least one power amplifier channel adapted to receive at least an audio signal;
an acoustic emitter capable of emitting two primary waves in the audible frequency range, wherein the length of the emitter is at least four times a wavelength of the lowest frequency of the primary waves, and the depth of the emitter is less than one forth the wavelength of the length lowest frequency of the acoustic emitter, wherein the dimensions of the emitter enable the primary waves to be propagated in a directional column of sound;
wherein the two primary frequencies are emitted at a sufficient level to drive surrounding air into nonlinearity, thereby creating a secondary wave having a frequency equal to the difference of the two primary wave frequencies; and
wherein the primary and secondary waves are at a sufficiently high intensity level to cause pain to a human target. - View Dependent Claims (60)
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Specification